Carlos Alcaraz always captures attention while on the court … but this time his tennis play had nothing to do with the eyes on him — his hot body did!

The 23-year-old Spanish pro took the court in New York City for the third round of the U.S. Open Friday … and slipped off his brown sleeveless shirt in full view of the audience — giving fans a chance to drink in his physique.

You’ve gotta watch the clip … members of the crowd go crazy — flashing lecherous smiles as they watched him disrobe.

Even the announcers note Carlos is taking his sweet time stripping down … allowing fans to take pictures and wolf-whistle to their hearts’ content.

While the striptease was exciting, the match itself wasn’t … Carlos dominated in three straight sets to advance to the Round of 16. He’s set to play American Tommy Paul Sunday.